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III International Conference

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PP-II-131Optimal conditions were determined for hydroetoxycarbonylation andhydromenthoxycarbonylation of isobutylene in the presence of catalytic system Pd (Acac) 2 -PPh 3 -TsOH: T=100o C, Pco=2MPa, τ = 4-5h; the optimal [ROH]:[i-C 4 H 8 ]:[Pd(Acac) 2 ]:[PPh 3 ]: [TsOH] ratio is 434:550:1:3:12 and 434:550:1:7:12, respectively.The most probably is a hydride mechanism. Evidence for this proposal comes from theobservation of an exceptionally strong effect of the TsOH addition which, being a protondonor, facilitates formation of the primary active hydride complex HPd(PPh 3 ) 3 of the catalyticcycle.404

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